| Abstract [eng] |
Attosecond science is one of the fastest developing fields in the ultrafast laser physics. This field focuses on the observing and controling electronic movement in various substances. Flashes of light of attosecond duration have to be used in these experiments. To generate attosecond pulses, pulses of femtosecond duration and peak power of several terawatts are needed. \mbox{Moreover}, in order to generate isolated attosecond pulses, duration of these femtosecond pulses have to be several optical cycles. One of the most effective way to generate terawatt peak power and few cycle pulses is optical parametric chirped pulse amplification. There are demostrated only a few laser systems capable of generating terawatt peak power and close to several optical cycles pulses. The aim of this work was to broaden the amplification bandwidth of one of those systems using multicrystal amplification schemes to generate few cycle pulses. \par During this work femtosecond noncollinear amplifier using BBO and LBO crystals as an amplification medium in its amplification stages was constructed. Generation of 40 μJ energy pulses 700 - 1300 nm spectral bandwidth was demosntrated. Later this seed pulse was broadened to 60 ps and amplified in the optical parametric chirped pulse amplifier. In this amplifier several multicrystal amlification stages were used. Generation of 7 mJ energy and 6,2 fs bandwidth limited pulses was demonstrated in this amplifier. However, experimentally these pulses were compressed to 6,4 fs duration. In conclusion, during this work multicrystal amplification schemes were adapted to the optical parametric chirped pulse amplifier. This led to the generation of ~1 TW peak power two optical cycles pulses. |
